package chepter10.login;
import  java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.Scanner;

public class Login {
    /**
     *模拟添加用户业务
     */
    public static void main(String[] args) throws  SQLException{

        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B&useSSL=false";
            String username = "root";//数据库账户
            String password = "123456";
            conn = DriverManager.getConnection(url,username,password);
            /**
             * 终端用户登录
             * 不绑定数据使用conn.createStatement
             * 绑定数据使用 conn.prepareStatement(sql)
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("用户登录");
            System.out.println("请输入你的姓名:");
            String userName = sc.next();
            System.out.println("请输入你的密码：");
            String userPwd = sc.next();
            String loginSql = "select * from users wherr name=? and passoword=?";
            PreparedStatement pm = conn.prepareStatement(loginSql);
            pm.setString(1,userName);
            pm.setString(2,userPwd);
            rs = pm.executeQuery();//executeQuery返回多行数据 excuteUpdate()返回一个int
            System.out.println("id | name | password "+"| eamil |birthday");
            while (rs.next()) {
                int id = rs.getInt("id");
                String name = rs.getNString("name");
                if (id > 0) {
                    System.out.println(name + "登陆成功！");
                    //如果数据库中有两个同密码的人 直接结束循环 只提示一个人
                    break;
                }
            }
        }
        catch (ClassNotFoundException e){
            e.printStackTrace();
        }
        finally {
            //6.回收资源
            if (rs != null){
                try{
                    rs.close();
                }catch (SQLDataException e){
                    e.printStackTrace();
                }
                rs = null;
            }
            if (stmt != null){
                try{
                    stmt.close();
                }
                catch(SQLDataException e){
                    e.printStackTrace();
                }
                stmt = null;
            }
            if (conn != null){
                try{
                    conn.close();
                }catch(SQLDataException e){
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}


